US Expat Tax Services for UK RSUs and Share Options |

US Expat Tax Services for UK RSUs and Share Options |

US Expat Tax Services for UK RSUs and Share Options

US Expat Tax Services on UK RSUs and Share Options

US expat tax services for Americans employed in the United Kingdom who receive equity compensation — restricted stock units, share options, or employer share purchase schemes — address one of the most complex intersections of UK employment tax law and US income tax law. The UK employer correctly operates PAYE on the vest or exercise event, deducting UK income tax and NIC from the share value through the payroll, and that UK income tax is a creditable foreign tax on Form 1116. However, the US reporting of the same vest or exercise event requires separate calculations — the dollar value of the shares at the vest or exercise date, the dollar cost basis established for subsequent disposal, and the correct classification of the gain on eventual sale as ordinary income or capital gain, depending on the holding period and the type of award. Furthermore, the most common equity compensation error for UK-employed Americans is not the vest event itself — which most advisers correctly include in wages income — but the subsequent share disposal, where the cost basis is set at the vest value and the gain or loss on the sale must be correctly calculated. Additionally, certain UK-specific share schemes — the Save As You Earn scheme, the Share Incentive Plan, and the Company Share Option Plan — have specific UK tax advantages that do not translate into equivalent US benefits, creating a combined tax analysis that differs from both the UK-only and US-only positions. Consequently, the complete US expat tax services framework for a UK-employed American with equity compensation covers the vest or exercise event, the US basis establishment, the disposal reporting, the Form 1116 credit for UK PAYE on the vest, and the scheme-specific analysis for any UK-advantaged share arrangement.

RSU Vesting: Income at Vest

The UK and US Treatment at Vest

When a UK employer's RSU vests — the date on which the employee becomes the unconditional owner of the shares — the market value of the shares on the vest date is taxable employment income in both the United Kingdom and the United States. Furthermore, the UK employer deducts PAYE income tax and NIC from the vest value through the payroll — using the share price on the vest date multiplied by the number of shares vesting. Additionally, the same vest value is included in the US wages income on the Form 1040 — the sterling vest value converted to US dollars at the spot exchange rate on the vest date. Consequently, US expat tax services confirm the vest date, the number of shares, and the share price on the vest date for every RSU vest event — calculating the dollar wages income independently from the sterling wages income shown on the P60. The IRS RSU guidance is at https://www.irs.gov/faqs/interest-dividends-other-types-of-income/employee-stock-purchase-plans-stock-option-plans-stock-appreciated-units/employee-stock-purchase-plans-stock-option-plans-stock-appreciated-units.

Establishing the Dollar Cost Basis at Vest

The dollar cost basis of shares acquired through RSU vesting is the dollar value of the shares on the vest date — the same amount that is included in wages income. Furthermore, this basis is essential for the correct reporting of the subsequent share disposal — the gain or loss on the sale is calculated as the sale proceeds minus the dollar cost basis established at vest. Additionally, where the employee holds multiple RSU vestings over time — each with a different vest date and a different share price — a separate cost basis must be maintained for each vest tranche, since each tranche has its own basis and its own holding period. Consequently, US expat tax services maintains a running RSU basis schedule for every equity compensation client — recording the vest date, the number of shares, the share price at vest, and the resulting dollar basis for each tranche. The IRS cost basis guidance is at https://www.irs.gov/taxtopics/tc703.

Share Option Exercises: NSO and ISO Treatment

Non-Qualified Stock Options in the UK Context

Most UK employer share options — including Company Share Option Plan options and unapproved options — are treated as non-qualified stock options for US purposes. Furthermore, the spread on exercise — the difference between the exercise price and the market price on the exercise date — is ordinary income for US purposes, included in wages income in the year of exercise. Additionally, the UK employer typically deducts PAYE on the same spread, making the UK income tax on the option exercise creditable on Form 1116 general basket. Consequently, US expat tax services calculate the exercise spread in US dollars at the exchange rate on the exercise date — confirming this as the additional wages income for the year and establishing the dollar cost basis of the shares acquired at the exercise price plus the spread. The IRS stock option guidance is at https://www.irs.gov/taxtopics/tc427.

Enterprise Management Incentive Options

Enterprise Management Incentive options — the HMRC-approved option plan that provides significant UK tax advantages for qualifying smaller companies — are treated as non-qualified stock options for US purposes, despite their UK-approved status. Furthermore, under EMI, the UK income tax on exercise is calculated only on any market value discount at grant, meaning where the exercise price equals the market value at grant, no UK PAYE applies at exercise. Additionally, the gain from exercise price to sale price is UK CGT rather than UK income tax for qualifying EMI options. Consequently, the combined US and UK tax analysis for EMI options differs from standard NQSOs — the US expat tax services calculation must confirm the UK tax treatment at grant, exercise, and disposal to correctly calculate the Form 1116 credit and the US income inclusion for each event. The HMRC EMI guidance is at https://www.gov.uk/tax-employee-share-schemes/enterprise-management-incentives-emis.

Section 83(b) Elections for Restricted Shares

When a Section 83(b) Election Applies

A Section 83(b) election — which must be filed with the IRS within 30 days of receiving restricted shares subject to a vesting schedule — allows the employee to include the value of the shares at grant in wages income immediately, rather than at each vest date. Furthermore, where the share price is expected to increase significantly during the vesting period, a Section 83(b) election at grant converts what would have been ordinary income at each vest date into capital gain from the grant date — potentially saving significant US income tax at the higher ordinary rates. Additionally, the 30-day deadline for a Section 83(b) election is absolute — there is no extension, and a missed election cannot be made retroactively. Consequently, US expat tax services advise every UK-employed American who receives restricted shares with a vesting schedule to assess the Section 83(b) election opportunity within the first week of grant, confirming the election mechanics and the US income at grant before the 30-day window closes. The IRS Section 83(b) guidance is at https://www.irs.gov/irb/2012-28_IRB.

Section 83(b) in the UK Employment Context

The Section 83(b) election is a US-only mechanism — it has no equivalent under UK tax law, and the UK employer's PAYE obligations at vest continue regardless of any Section 83(b) filing. Furthermore, where a Section 83(b) election is made, the US includes the grant-date value in wages income immediately, but the UK does not accelerate the employment income charge, which continues to arise at each vest date. Additionally, this creates a mismatch where US income is recognised at grant and UK income is recognised at vest — meaning the Form 1116 credit for UK PAYE must be carefully timed to match the UK income event rather than the US recognition event. Consequently, US expat tax services specifically address this timing difference in the annual return for any client who has made a Section 83(b) election — ensuring the Form 1116 credit for UK PAYE at each vest date is correctly allocated to the correct US return year.

UK-Specific Share Schemes

Save As You Earn Scheme

The SAYE scheme — the save as you earn employee share option plan — allows UK employees to save a fixed monthly amount and then use the savings to purchase employer shares at a discounted price (up to 20% below the market price at the start of the savings period). Furthermore, for UK tax purposes, the SAYE option exercise is entirely free of UK income tax — the discount and any share price growth during the savings period are not subject to PAYE. Additionally, for US purposes, the SAYE scheme does not qualify as an incentive stock option plan under the US rules — meaning the discount and any gain on exercise may be subject to US income tax as ordinary income even where no UK income tax arises. Consequently, US expat tax services carefully analyse the SAYE exercise for any US-citizen participant — confirming the US income inclusion for the exercise spread even where the UK P60 shows no PAYE on the share acquisition. The HMRC SAYE guidance is at https://www.gov.uk/tax-employee-share-schemes/save-as-you-earn-saye.

Share Incentive Plan

The Share Incentive Plan provides UK employees with free shares, partnership shares (purchased with pre-tax salary), and matching shares — all UK income tax and NIC-free where the shares are held within the plan for the required period. Furthermore, for US purposes, the SIP does not provide the same tax exemption — the value of free shares received is US-taxable employment income, and the pre-tax salary used to purchase partnership shares does not reduce US taxable wages in the same way it reduces UK taxable wages. Additionally, any growth in the value of shares held within the SIP is UK CGT-free on disposal where the shares are taken directly from the plan — but the same disposal is subject to US capital gains tax calculated from the US cost basis. Consequently, US expat tax services include SIP shares in the US wages income analysis for each year they are received — confirming the dollar value of free and matching shares at the award date and the US cost basis for subsequent disposal. The HMRC SIP guidance is at https://www.gov.uk/tax-employee-share-schemes/share-incentive-plans-sips.

Share Disposal: Ordinary Income vs Capital Gain

The Holding Period Determines the US Tax Rate

When the employee sells shares acquired through RSU vesting, option exercise, or a share scheme, the gain above the US cost basis is taxed at the long-term capital gains rate (0%, 15%, or 20%) where the shares have been held for more than one year from the acquisition date — and at the ordinary income rate (up to 37%) where the holding period is one year or less. Furthermore, the acquisition date for RSU shares is the vest date — not the date the RSU was granted — meaning the one-year holding period clock starts from each vest event. Additionally, where the employee sells shares shortly after vesting — a same-day or same-week sale — the entire proceeds above the US basis are short-term capital gain taxed at ordinary income rates, with no preferential rate. Consequently, US expat tax services tracks the acquisition date and US cost basis for every share tranche — confirming the holding period at the time of any sale to determine whether the gain qualifies for long-term treatment. The IRS capital gains guidance is at https://www.irs.gov/taxtopics/tc409.

The Form 1116 Credit for UK CGT on Share Sales

Where the share disposal also generates UK CGT — on shares held outside a tax-advantaged wrapper — the UK CGT is creditable on Form 1116 passive basket against the US capital gains tax on the same disposal. Furthermore, the UK CGT is calculated in sterling using the sterling acquisition cost (the vest or exercise price for UK purposes) and the sterling sale proceeds, and converted to dollars at the disposal-date spot rate for Form 1116. Additionally, where the UK CGT on the disposal exceeds the US capital gains tax, the excess generates a passive basket carryforward for up to ten years. Consequently, US expat tax services calculate the UK CGT and the Form 1116 passive basket credit simultaneously with the US Schedule D calculation for every share disposal — ensuring the foreign tax credit is correctly applied and any excess credit is tracked in the passive basket carryforward.

The FBAR for Share Accounts

The Nominee Share Account Is FBAR-Reportable

Where the employer shares acquired through RSU vesting or option exercise are held in a nominee share dealing account at a UK broker or custodian, that account is a foreign financial account for FBAR purposes. Furthermore, the FBAR balance for the nominee account is the highest market value of all shares held in the account during the US calendar year, at the highest point during the year, not at year-end. Additionally, where shares from multiple vest events are held in the same nominee account alongside other employer share awards, the FBAR balance covers the combined value of all holdings in the account at the peak point during the year. Consequently, US expat tax services identify the specific custodian account where employer shares are held and confirm the highest annual value from the account statements — including the nominee account in the FBAR aggregate for every year it holds a balance. The FinCEN FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

Case Study: RSU Vest and Sale Combined

Our team provides US expat tax services for a US citizen employed at a London technology company that grants RSUs annually. Furthermore, in the most recent year, she had two RSU vest events — 500 shares vesting in March (share price £42.80) and 500 shares vesting in September (share price £48.60). She sold all 1,000 shares in November at a price of £51.20.

The US expat tax services analysis covered the following. March vest: 500 shares × £42.80 = £21,400 wages income. Dollar wages: £21,400 at 1.27 spot rate = $27,178. UK PAYE on March vest approximately £8,560 at 40% ($10,871) — creditable on Form 1116 general basket. September vest: 500 shares × £48.60 = £24,300 wages income. Dollar wages: £24,300 at 1.29 spot rate = $31,347. UK PAYE on September vests approximately £9,720 at 40% ($12,539) — creditable on Form 1116 general basket. Furthermore, November sale: 1,000 shares at £51.20 = £51,200 proceeds. US cost basis: March tranche 500 shares at $27,178 (8 months held — short-term); September tranche 500 shares at $31,347 (2 months held — short-term). Dollar proceeds: £51,200 at 1.28 spot rate = $65,536. Dollar gain: $65,536 minus $58,525 (combined basis) = $7,011 short-term capital gain taxed at ordinary income rates. UK CGT: sterling gain £51,200 minus £45,700 (£21,400 + £24,300) = £5,500 after the £3,000 annual exempt amount, £2,500 at 20% = £500 UK CGT. Form 1116 passive basket credit for UK CGT: £500 ($640) — eliminates any US tax on the short-term gain that might otherwise exceed the general basket credit. Consequently, the combined annual return covers two vest events in wages income, Form 1116 general basket credits for PAYE on both vests, the short-term capital gain on the sale, and the Form 1116 passive basket credit for UK CGT — all as components of a single coordinated annual engagement.

Common RSU and Share Option Mistakes

Not Maintaining a Per-Tranche Basis Schedule

The most common disposal error is calculating the US gain from the total sterling basis rather than tracking each vest tranche separately. Furthermore, using an averaged or combined basis produces an incorrect US gain calculation. The correct approach requires US expat tax services to maintain a running basis schedule for every client with RSU or option awards — recording each vest or exercise event with its date, share count, price, and dollar basis separately. IRS basis guidance is at https://www.irs.gov/taxtopics/tc703.

Missing the Section 83(b) Election Deadline

The 30-day deadline for a Section 83(b) election is absolute — there is no extension under any circumstances. Furthermore, the cost of missing the election for high-growth shares can be very high — ordinary income at the higher vest values instead of capital gain from the lower grant value. The correct approach requires US expat tax services to assess the Section 83(b) opportunity in the first week of any restricted share grant and file the election immediately where it is beneficial. IRS Section 83(b) guidance is at https://www.irs.gov/irb/2012-28_IRB.

Not Recognising US Income on SAYE Exercises

Many UK-employed Americans who exercise SAYE options assume that the UK tax-free treatment means the exercise is also US tax-free. Furthermore, the SAYE scheme does not qualify for ISO treatment in the US — the exercise spread is ordinary income for US purposes regardless of the UK position. The correct approach requires US expat tax services to specifically analyse the US income inclusion for every SAYE exercise — regardless of whether any UK PAYE was deducted. HMRC SAYE guidance is at https://www.gov.uk/tax-employee-share-schemes/save-as-you-earn-saye.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist US expat tax services for Americans in the UK with employer equity compensation. Furthermore, we confirm the dollar wages income at each RSU vest and option exercise, maintain the per-tranche basis schedule for all equity awards, advise on Section 83(b) election eligibility within the 30-day window, analyse the US income position for SAYE and SIP scheme events, calculate the Form 1116 general basket credit for PAYE on vest and exercise events, prepare Schedule D for share disposals with the correct holding period, calculate the Form 1116 passive basket credit for UK CGT on disposals, and include the nominee share account in the FBAR at its highest annual balance.

Contact our team today. Email hello@us-uktax.com call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

UK equity compensation creates a layered annual compliance requirement for Americans — vesting income in wages at the dollar equivalent of the sterling vest value, a Form 1116 general basket credit for the UK PAYE on the same income, a per-tranche dollar cost basis established at each vest event, and a Schedule D disposal gain or loss calculated from that basis. Furthermore, US expat tax services that correctly track each vest tranche separately, analyse the Section 83(b) opportunity within the 30-day window, addresses the UK-specific SAYE and SIP scheme differences from their apparent US equivalents, and include the nominee share account in the FBAR produce the complete annual picture that equity compensation requires. Moreover, the SAYE exercise — apparently tax-free in the UK — is a taxable US event that many non-specialist advisers miss. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

Contact Us

US-UK Tax | hello@us-uktax.com | 0333-8807974

https://www.us-uktax.com

FAQs

Q: When is RSU vest income taxable in the US?

A: At the vest date, the sterling vest value converted to dollars at the vest-date spot rate is ordinary income in the US in the year of vest.

Q: What is the US cost basis of RSU shares?

A: The dollar value of shares on the vest date — included in wages. A separate basis must be tracked for each vest tranche with its own date and share price.

Q: How does Section 83(b) work for UK restricted shares?

A: Filing within 30 days of the grant includes the grant-date value in wages, converting growth to capital gain. The UK continues to tax at each vest date regardless.

Q: Is a SAYE option exercise taxable in the US?

A: Yes. The SAYE scheme does not qualify as a US incentive stock option plan. The exercise spread is US ordinary income, even where no UK PAYE arises at exercise.

Q: What US tax applies when RSU shares are sold?

A: Long-term rate where held over one year from vest, short-term ordinary rates if one year or less. The vest date starts the holding period, not the grant date.

Q: Is the nominee share account FBAR-reportable?

A: Yes. The custodian share account is a foreign financial account — at its highest annual market value, with all vested tranches in the account included combined.